Improve error messaging of webRequest API in case of conflicts

chrome/browser/extensions/api/web_request/web_request_api_helpers.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Helper classes and functions used for the WebRequest API.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_API_WEB_REQUEST_WEB_REQUEST_API_HELPERS_H_
 #define CHROME_BROWSER_EXTENSIONS_API_WEB_REQUEST_WEB_REQUEST_API_HELPERS_H_
 
 #include <list>
 #include <set>
 #include <string>
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/linked_ptr.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/time.h"
 #include "googleurl/src/gurl.h"
 #include "net/base/auth.h"
 #include "net/http/http_request_headers.h"
 #include "net/http/http_response_headers.h"
 #include "webkit/glue/resource_type.h"
 
+class ExtensionWarningSet;
+
 namespace base {
 class ListValue;
 class Value;
 }
 
 namespace extensions {
 class Extension;
 }
 
 namespace net {
@@ skipping 170 matching lines @@
 void MergeCancelOfResponses(
     const EventResponseDeltas& deltas,
     bool* canceled,
     const net::BoundNetLog* net_log);
 // Stores in |*new_url| the redirect request of the extension with highest
 // precedence. Extensions that did not command to redirect the request are
 // ignored in this logic.
 void MergeOnBeforeRequestResponses(
     const EventResponseDeltas& deltas,
     GURL* new_url,
-    std::set<std::string>* conflicting_extensions,
+    ExtensionWarningSet* conflicting_extensions,
     const net::BoundNetLog* net_log);
 // Modifies the "Cookie" header in |request_headers| according to
 // |deltas.request_cookie_modifications|. Conflicts are currently ignored
 // silently.
 void MergeCookiesInOnBeforeSendHeadersResponses(
     const EventResponseDeltas& deltas,
     net::HttpRequestHeaders* request_headers,
-    std::set<std::string>* conflicting_extensions,
+    ExtensionWarningSet* conflicting_extensions,
     const net::BoundNetLog* net_log);
 // Modifies the headers in |request_headers| according to |deltas|. Conflicts
 // are tried to be resolved.
 void MergeOnBeforeSendHeadersResponses(
     const EventResponseDeltas& deltas,
     net::HttpRequestHeaders* request_headers,
-    std::set<std::string>* conflicting_extensions,
+    ExtensionWarningSet* conflicting_extensions,
     const net::BoundNetLog* net_log);
 // Modifies the "Set-Cookie" headers in |override_response_headers| according to
 // |deltas.response_cookie_modifications|. If |override_response_headers| is
 // NULL, a copy of |original_response_headers| is created. Conflicts are
 // currently ignored silently.
 void MergeCookiesInOnHeadersReceivedResponses(
     const EventResponseDeltas& deltas,
     const net::HttpResponseHeaders* original_response_headers,
     scoped_refptr<net::HttpResponseHeaders>* override_response_headers,
-    std::set<std::string>* conflicting_extensions,
+    ExtensionWarningSet* conflicting_extensions,
     const net::BoundNetLog* net_log);
 // Stores a copy of |original_response_header| into |override_response_headers|
 // that is modified according to |deltas|. If |deltas| does not instruct to
 // modify the response headers, |override_response_headers| remains empty.
 void MergeOnHeadersReceivedResponses(
     const EventResponseDeltas& deltas,
     const net::HttpResponseHeaders* original_response_headers,
     scoped_refptr<net::HttpResponseHeaders>* override_response_headers,
-    std::set<std::string>* conflicting_extensions,
+    ExtensionWarningSet* conflicting_extensions,
     const net::BoundNetLog* net_log);
 // Merge the responses of blocked onAuthRequired handlers. The first
 // registered listener that supplies authentication credentials in a response,
 // if any, will have its authentication credentials used. |request| must be
 // non-NULL, and contain |deltas| that are sorted in decreasing order of
 // precedence.
 // Returns whether authentication credentials are set.
 bool MergeOnAuthRequiredResponses(
     const EventResponseDeltas& deltas,
     net::AuthCredentials* auth_credentials,
-    std::set<std::string>* conflicting_extensions,
+    ExtensionWarningSet* conflicting_extensions,
     const net::BoundNetLog* net_log);
 
 // Returns whether |type| is a ResourceType that is handled by the web request
 // API.
 bool IsRelevantResourceType(ResourceType::Type type);
 
 // Returns a string representation of |type| or |other| if |type| is not handled
 // by the web request API.
 const char* ResourceTypeToString(ResourceType::Type type);
 
 // Stores a |ResourceType::Type| representation in |type| if |type_str| is
 // a resource type handled by the web request API. Returns true in case of
 // success.
 bool ParseResourceType(const std::string& type_str,
                        ResourceType::Type* type);
 
 // Returns whether |extension| may access |url| based on host permissions.
 // In addition to that access is granted to about: URLs and extension URLs
 // that are in the scope of |extension|.
 bool CanExtensionAccessURL(const extensions::Extension* extension,
                            const GURL& url);
 
 // Triggers clearing each renderer's in-memory cache the next time it navigates.
 void ClearCacheOnNavigation();
 
 }  // namespace extension_web_request_api_helpers
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_WEB_REQUEST_WEB_REQUEST_API_HELPERS_H_